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1991-10-17
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DCOPY(1)
NAME
dcopy V3.3 - physical sector to sector copy program
Copyright (c) 1985-91 Joerg Genius - Munich
I make this software free to anyone for non commercial use
under the conditions that nothing is charged for the program
and the copyright notice has not been modified.
SYNTAX
dcopy source: destination:[[ /v] || [ /r]]
dcopy source: filename[.IMG][ /n]
dcopy filename[.IMG] destination:[[ /v] || [ /r]][ /n]
DESCRIPTION
Dcopy is a general purpose sector_to_sector copy program
for a wide vaiety of disks. Nearly any disks can be
copied 'as is'. That means no check is made for the
directory/file structure or anything else.
In addition to normal disk-to-disk copy capabilities DCOPY
can write the physical contents of a disk to either a
compressed or normal (not compressed) datafile on the
harddisk.
This enebles especially users of large networks to
exchange whole diskettes including bootarea via their
network.
the following disktypes are recognized :
IBM SS/DD, 8 sectors/track, 40 tracks, 160 kbyte, 5.25 inch
IBM SS/DD, 9 sectors/track, 40 tracks, 180 kbyte, 5.25 inch
IBM DS/DD, 8 sectors/track, 40 tracks, 320 kbyte, 5.25 inch
IBM DS/DD, 9 sectors/track, 40 tracks, 360 kbyte, 5.25 inch
IBM DS/HD, 15 sectors/track, 80 tracks, 1200 kbyte, 5.25 inch
IBM DS/DD, 9 sectors/track, 80 tracks, 720 kByte, 3.5 inch
IBM DS/DD, 18 sectors/track, 80 tracks, 1440 kByte, 3.5 inch
DEC SS/QD, 10 sectors/track, 80 tracks, 400 kbyte, 5.25 inch (RX50)
There must be parameters for both source and destination.
One of the parameters may be replaced by a filename. In
this case the whole diskimage is written (if destination
is given a .IMG filename) or read (if source is an .IMG
file) from a imagefile on a harddisk (or network). If the
file extension is omitted .IMG is assumed.
You have two choices to handle diskimage files : by
default DCOPY will produce a very own but useful file
format: the first two byte are the capacity of the
original disk in 512 byte blocks. Now a sector bitmap
follows. The lenght of the bitmap depends on the total
number of blocks on the disk. For every 8 blocks one
more byte is needed. A hight bit in this bitmap means the
appropriate sector consists of 512 equal bytes. In this
case the corresponding byte in a sector bytemap following
the bitmap is set to this value. By this method it is
possible, to make diskimage files much smaller. An empty
MS-DOS formatted disk only takes about 10 kbyte instead of
400.
For some special purpose it may be useful to write the
whole, uncompressed diskimage to the harddisk. To do that
simply add '/n' at the end of the commandline. This
switch wors for both directions of copying.
An optional switch /v will force a sector_by_sector
verification of the destination disk after copy. The /r
option switches DCOPY into read/verify only mode. These
two switches are valid only with if destination is a
floppy.
FILES
dcopy.exe executable code for MS-DOS
dcopy.doc this file
Sources can be requested from the author.
BUGS
Version 3.xx of DCOPY is NOT compatible with the 2.xx imagefile
format. 2.xx had a very special sector interleaving for use with
Digital's Professional 300 and 350 computers.
NOTES
Version 3.3.0 now supports 3.5 inch disk formats
Version 3.3.1 and 3.3.2 minor bugfixes
Please report any bugs and comments to
Joerg K. Genius
Saarlouiser Str. 40
D-8000 Munich 50
or via network :
MUNICH::GENIUS (EASYnet)
joerg@decum.uucp